Relate the structure of the retina to its function. Explain how the Essay

Relate the structure of the retina to its function. Explain how the retina changes due to retinitis pigmentosa - Essay Example The photoreceptors function by receiving information transmitted in the form of light. This information is then transferred to the optic nerves, to the brain through the optic disc, the spot on the lower outside of the retina. The eye has two major cavities filled with clear water liquid. One, is located between the lens and the cornea, which is filled by the aqueous humor. The other is located behind the lens within the eyeball itself, just touching the retina. This is filled by the jellylike vitreous humour which constitutes the bulk of the eye. These liquids function as liquid lenses. Similar to the cornea and most parts of the eye, their function is to focus the light into the retina as liquid lenses. As said earlier, the retina houses the photoreceptors so that information can then be transferred to the brain for interpretation (Vander, et. Al, 2001). The main question now is why is the retina placed as far inside the eye where information has to be passed from many different parts like cornea, pupil and liquid lenses, and when speed of information transmission is very necessary especially in sensory organs. The last thought exactly answers the structural question of the anatomy of the eye. The retina is structured to layer the inner cavity of the eye to allow more surface area for information to be passed to the many different photoreceptors housed in the retina. The liquid vitreous humor helps disperse this light so that information can pass to the photoreceptors at a single instant instead of the light being directed at a single line and spreading to the many different photoreceptors in the retina. This means that the retina is perfectly structured for speed in processing of information. It is also easier to vascularize this way than if the whole cavity is filled with retinal cells (Feinberg, 2004). What is it with the retina that allows its function? The retina contains two types of

Corporate Finance Essay Example | Topics and Well Written Essays - 250 words

Corporate Finance - Essay Example The flat world is here to stay, and has conquered both time and distance. Thomas Friedman is a thinker and a futurist par excellence, as his book ‘The World is Flat’ (2005) clearly shows. In the book, Friedman makes out a compelling case for a series of revolutions that have transformed the world to be what it is today. Friedman states that the availability of the internet and digital technology at a cheaper rate has enabled developing nations like India compete with Americans for jobs in the service sector. In the coming days, the author argues excellently that most of world manufacturing will be handled by China, which we can see increasingly in evidence if we look at the manufacturer’s label on most of our household electronics and appliances. This has already pushed China to be in line with the USA and Japan as one of the world’s largest economies (Friedman, 2005). Commenting recently in his ever popular column in the New York Times, Friedman argues now that the World is Full. Scientists have calculated that we are presently using up the Earth resources (especially in China) at the rate of 1.5 times the available supply. It does not take much to reason out the damage this is doing to the carbon footprint. In fact, the Australian environmentalist and entrepreneur Paul Gilding is arguing that with the paucity of resources and rising prices everywhere, we could be heading for another crisis. The answer lies in population control and killing off the consumerist economy. When we have lesser mouths to feed, we will do better in providing jobs. The world’s resources and ecosystems will be in balance, food prices can be controlled and we can better handle the vagaries of weather and crop protection. It all makes sense when we see how things are connected. We see not only how things are, but what we have to do to get out of a crisis. President Obama heaved a sigh of relief as he announced that a deal on increasing America’s debt ceiling had